What interesting phenomenon is dynamically being illustrated in the applet below?
(Feel free to move any of the blue points and soon-to-appear purple point anywhere you'd like.)
In a regular pentagon, the areas of the
yellow triangle and
light green triangle are both equal.
(Source: This
tweet from
Solve My Maths).
This applet informally shows these two triangles have the
same base and
same height. Thus, they have the same area.
